You would need to determine if the swan is owned by someone and if it had an original mate or if something happened to its mate. If it is a loner and found the pond, it could fly out and try to relocate to another pond with other swans if there are other swans in an area. If the swan was an original swan with a mate, then it will usually not re-pair if it is a male and something happened to the female. If it is a female swan that has lost its mate, she will try to re-pair if there is another swan in the area. All of this is determined by whether the swan can fly. If they are pinioned (rendered permanently unable to fly), then they will not be able to leave the area. If the swan can fly, but likes the area, there is an ample food supply, adequate shelter from predators and inclement weather and preening area, then the swan will do just fine on its own and will probably not look for a mate. The Regal Swan